| Summary: | 碩士 === 國立彰化師範大學 === 電機工程學系 === 104 === When communication is disable in the disaster areas, using relay system via aerial platforms as a temporary base station is a viable solution. Furthermore, we consider that there are a lot of people in the disaster areas. In order to in-crease channel capacity, relay station equipped with multiple-input multi-ple-output(MIMO) system is required. In this paper, the wireless channel characteristics were simulated. First, we studied the signal fading in the channel to evaluate the gain needed in the relay system. Secondly, we estimate channel capacity of 2x2x2 MIMO relay channel system. The typical two-dimensional wireless channel modeling on the plane can not be considered the height of the relay station and undulating height of the disaster obstacle. According to the reference models, a two-dimensional and a three-dimensional relay MIMO channel models are modeled to compare estimate results of both model. The height of the relay station and height distribution of the disaster obstacle are joined in three-dimensional channel model.
In the simulations of this paper, we set several conditions for the disaster communications. Two kinds of proposed model are used to estimate path loss, spatial correlation coefficient ,and ergodic capacity. Based on the results , the data differences between using two-dimensional model and using three-dimensional are not significant in our applications.
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